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Old 06-28-2004, 11:32 AM   #1
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Voltage Issue

My 1981 MH with the Isuzu was showing the volts in the red range on the voltmeter. Replaced the voltage reulator and the power output still shows way up in the red range. Any suggestions?
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Old 06-28-2004, 11:53 AM   #2
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Which Voltage?

If you are referring to the chassis alternator, check each cell in each of the batteries connected to the alternator. Then give each battery a "drain" check - put a known load on the batteries and check the voltage drops. A battery service center should be able to do this.

Check the actual voltage in the charging circuit at varoius points within the circuit. These points include alternator output, isolator in, isolator out, (the isolator "splits" the charge circuit to the house battery and the chassis battery), and the voltage at each battery (check both the terminal clamps and the terminal posts) while the engine is running.

If you are convinced the new voltage regulator is good, sounds like a wiring or battery problem to me.

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Old 07-06-2004, 10:38 AM   #3
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Problem corrected

I got back into the problem. The batteries where checked and found to be good. Put batteries back in service and broke out the voltage testor. The readings at the batteries and at the isolatotors were all in the 14.5 volt range. ( The volt gage showed over 18 volts). I then hooked the voltage tester to the back of the voltage gage and it also ran in the 14.5 volt range. The problem was a malfunctioning voltage gage. Purchased new gage and installed it. Everything is working fine.
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